|Publication number||US4061245 A|
|Application number||US 05/669,348|
|Publication date||Dec 6, 1977|
|Filing date||Mar 22, 1976|
|Priority date||Mar 22, 1976|
|Also published as||CA1094993A, CA1094993A1|
|Publication number||05669348, 669348, US 4061245 A, US 4061245A, US-A-4061245, US4061245 A, US4061245A|
|Inventors||Joseph A. Lotspeich|
|Original Assignee||Gross-Given Manufacturing Company|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (6), Referenced by (67), Classifications (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Use of helical coil in vending machines as a means for transporting an item to be vended from a location within the machine to a point of discharge from the machine, by rotation of the vending coil has long been known. See for example U.S. Pat. No. 3,269,595. Typically, the vending coil has been used in conjunction with a horizontal support tray, wherein the item to be vended is placed within the windings of the vending coil and is supported by the tray. By rotating the vending coil, the item to be vended is longitudinally advanced along the tray, under force from the windings of the vending coil until it reaches the front end of the tray. Upon further rotation of the vending coil, the item to be vended is forced over the edge of the tray and falls into a discharge bin.
Early prior art vending machines of this type were configured to mount the support trays within the helical coil. This configuration, however, was particularly susceptible to problems resulting when the package to be vended got caught between the vending coil and the tray. Upon reaching the front edge of the tray, rather than falling into the discharge bin, the items so caught would hang-up at the front end of the vending coil, thus jamming the coil discharge mechanism. Various techniques have been used to eliminate this type of problem. For the most part, such techniques have incorporated means for supporting the vending coil above the tray so as to prevent the items being vended from getting caught between the vending coil and the tray. Further, to alleviate the jamming problem at the discharge end of the coil, most prior art techniques included extending the length of the vending coil significantly past the end of the support tray.
However, such prior art techniques have caused problems of their own. The coil support means have typically taken up space within the windings of the vending coil and have necessitated using large support members, requiring significantly more material, and thus increasing the cost of the machine. Further, such techniques have not totally solved the problem of items being caught, since oftentimes the items being vended will still lodge between the vending coil and the support apparatus itself, thus jamming the coil discharge apparatus. The present invention provides apparatus which minimizes the above problems associated with prior art vending machines.
Another disadvantage to many of the helical coil type vending machines of the prior art is the incapability in such machines to interchange their coils. If maximum use is to be made of available tray area, differently sized coils are required for items having different package sizes. The present invention contemplates the use of at least two basic coil sizes, one for items having larger, bulkier packages such as pastries and potato chips, and a second for smaller less bulky packages of items such as candy bars.
Still another disadvantage of the helical coil vending machines of the prior art is that with such devices, upon reaching the discharge end of the tray, the item to be vended does not always fall freely from the tray. This is particularly troublesome with items having a relatively tall package dimension. When such packages are slowly pushed forward by the helical coil and dropped over the edge of the support shelf, they tend to tip forward, rather than falling straight down, and oftentimes become wedged between the outer cabinet of the machine and the leading edge of the support tray. Such a jam typically requires maintenance and, denies the purchaser of that item for which he has paid. The present invention solves the problem by providing a positive item ejection apparatus.
The present invention solves the above problems associated with prior art vending machines. This invention includes coil support apparatus which minimizes the probability of an item package getting caught between the coil and its associated support tray. This invention also provides for the interchangeability between coils of various sizes and incorporates means designed to assure a smooth discharge of the vended item from the tray.
The present invention comprises an improved vending machine of the type utilizing helical vending coils and associated support trays for delivering items to be vended fron positions upon the respective trays within the vending machines to the leading or forward edges of the trays, from edges the items fall into a discharge bin. The invention includes an improved vending coil unit, a plurality of which units are placed along side one another within the machine, with each coil overlying an associated support tray or shelf. Each vending coil unit comprises a helical vending coil connected at one end thereof to a cross-bracket member. The cross-bracket member is secured by a bracket holding device near the back portion of the vending machine. The bracket holding device is connected to a rotatable shaft operatively connected for rotation by an electric motor. The opposite end of the coil is supported near the front of the machine by a coil support apparatus which is mounted at the forward edge of that shelf surface defined by a tray longitudinally disposed to underly the coil. The coil support apparatus is inclined at an angle to the shelf surface for enabling the smooth discharge of the item to be vended. The coil support apparatus is configured to support the vending coil above and out of contact with the underlying shelf surface. In one preferred embodiment, each vending coil unit comprises means for positively ejecting a vended item from its respective vending coil to assure free fall of the vended item from the edge of the shelf surface and into a discharge bin.
Referring to the Drawing, wherein like numerals represent like parts throghout the several views:
FIG. 1 is a view in front elevation of a vending machine of the present invention showing a possible arrangement of a plurality of support trays within the vending machine and a plurality of vending coil units overlying the respective support trays;
FIG. 2 is a fragmentary top plan view of a portion of one of the support trays of the vending machine disclosed in FIG. 1, as generally viewed along the plane of the Line 2--2 in FIG. 1;
FIG. 3 is a view in side elevation of a portion of the interior of the vending machine disclosed in FIG. 1, viewed generally along the plane of the Line 3--3 in FIG. 1, illustrating one of the vending coil units in extended position for loading thereof or preparatory to removal thereof from the machine;
FIG. 4 is an enlarged fragmentary view in front elevation of a vending coil unit and its associated underlying tray, as disclosed in FIG. 1, and constructed according to the principles of this invention;
FIG. 5 is a fragmentary sectional view of a portion of the vending coil unit and underlying support tray disclosed in FIG. 4, generally taken along the Line 5--5 in FIG. 4;
FIG. 6 is a fragmentary sectional view of the vending coil unit and underlying support tray disclosed in FIG. 4, generally taken along the Line 6--6 of FIG. 4;
FIG. 7 is a fragmentary sectional view of the securing mechanism for the rear portion of the vending coil disclosed in FIG. 4, generally as viewed along the Line 7--7 of FIG. 4;
FIG. 8 is a perspective view of the cross-bracket holding device disclosed in FIG. 7;
FIG. 9 is a view in rear elevation of cross-bracket holding device disclosed in FIG. 8;
FIG. 10 is a fragmentary sectional view of the lower vending coil units and underlying support trays of the vending machine disclosed in FIG. 1, generally as viewed along the Line 10--10 of FIG. 1;
FIG. 11 is a fragmentary sectional view of a vending coil unit disclosed in FIG. 10, generally taken along the Line 11--11 of FIG. 10;
FIG. 12 is a fragmentary sectional view of a portion of the vending coil unit of FIG. 11, illustrating a product to guide arm, and generally taken along the Line 12--12 of FIG. 11;
FIG. 13 is an enlarge fragmentary sectional view of a bracket and pivot arm portion of the vending coil unit of FIG. 11, taken generally along the Line 13--13 of FIG. 11;
FIG. 14 is a fragmentary view in front elevation of several of the vending coil units and underlying trays disclosed in FIG. 10;
FIG. 15 is a fragmentary sectional view of a support ramp member for the vending coil of the vending coil disclosed in FIG. 14, generally taken along the Line 15--15 of FIG. 14; and
FIG. 16 is a sectional view in rear elevation of the support ramp member disclosed in FIG. 15, generally taken along the Line 16--16 of FIG. 15.
Referring to the Drawing, wherein like numerals represent like elements throughout the several views, there is shown in FIG. 1 a dispensing machine 1 having an outer housing 2 with a plurality of dispensing trays 3 slidably mounted therein. The vending machine 1 also has a front door member 2(a) (illustrated in open position in FIG. 1)pivotally mounted to the outer housing 2, which door member is normally positioned to enclose the trays within the internal cavity of the housing 2. Since the support apparatus for each of the trays 3 is of generally identical construction, only one tray will be described, it being understood that the remaining trays 3 are of like construction and function. Referring to FIG. 3, each dispensing tray 3 is mounted within the housing 2 by means of a plurality of rollers 5(a)-5(c) respectively that travel within a pair of channels 4 attached to the interior of the outer housing 2. On each side of the trays 3 there is a front roller 5(a) located near the front portion 6 of the tray 3, a first rearwardly disposed roller 5(b) and a second rearwardly disposed roller 5(c) located near the back portion 7 of the tray 3. The first rear roller 5(b) is located forward of the second rear roller 5(c). Each guide channel 4 includes a top support surface 8 and a bottom support surface 9. The bottom support surface 9 of the channel 4 extends generally horizontally along its entire length, while the top support surface 8 includes an elongate horizontally disposed portion 10 located rearward of an inclined ramp portion 11, which is disposed toward the forward portion of the channel 4. The inclined ramp portion 11 enables the second rear roller 5(c) to vertically lift upward when the tray is pulled sufficiently forward, resulting in a pivoting of the forward portion 6 of the tray 3 in a downward direction about the axis of the first rear roller 5(b). Loading of articles to be dispensed is facilitated when the tray is pulled in its outermost downwardly tipped position, as illustrated in FIG. 3. A pair of stop members 12 and 13, mounted to the guide channel 4, engage the first and second rear rollers 5(b) and 5(c) respectively when the tray 3 is fully extended in its tipped-down position, to prevent removal of the tray from the guide channels 4 (see FIG. 3). Stop member 13 also engages the front roller 5(a) when the tray 3 is positioned in fully inserted position within the housing 2 to retain the tray 3 in its normally operative position.
The preferred embodiment of the present invention contains five trays 3 located within the outer housing 2. In the preferred embodiment, it has been found that the most advantageous arrangement of the trays 3 is to provide all except the middle tray 3(a) with the above-described tip-down mechanism. The middle tray 3(a) (FIGS. 1 and 3) is supported in side channels 14 having both the top surface 15 and the bottom support surface 16 thereof disposed generally horizontally along the entire length of the channels 14. Therefore, the middle tray 3(a) will not tip down when pulled forward in its fully extended position.
Each of the dispensing trays 3 contains a plurality of dispensing coil units 20. Each dispensing coil unit 20 contains an elongate generally rigid helical dispensing coil 21 having a generally circular cross-section and a front portion terminating in a first terminal 23 and a rear portion terminating at a second terminal 25. A continuous coil 21 contains a plurality of regularly spaced convolutions or windings 26. The inter-convolution spacing between the windings 26 of the dispensing coils 21 toward the rear portion thereof are rapidly decreased such that the last winding 28 directly abuts the next-to-the-last winding 29 (see FIGS. 2, 10, and 11).
A cross-bracket 30 is welded or otherwise fixedly attached to the rear portion of each vending coil 21 across the inner diameter of the last winding 28 of the coil (see FIGS. 2, 4, 7, 10 and 15). The cross-bracket 30 has a planar cnetral portion generally designated at 31 and two end portions 32, projecting generally perpendicularly to the central portion 31. The length of the middle portion 31 of the cross-bracket 30 equals the inner diameter of the last winding 28 of the coil 21 and has a hole 35 positioned at its longitudinal center. The end portions 32 of the cross-bracket 30 are of sufficient length to permit attachment thereof to at least the last winding 28 of the vending coil 21, by welding or other means, and preferably are of sufficient length to extend into the inner diameter of the coil 21 so as to engage and be connected to several windings thereof (see FIG. 10). When mounted to a coil 21, the longitudinal axis of the coil passes through the center of the hole 35 in the cross-bracket 30.
Appropriate motor means, generally designated at 40, are provided for rotating the vending coil 21. In the preferred embodiment, the motor means 40 includes an electric motor 41 which rotates a shaft 42 either directly or through an appropriate gear reducing apparatus 43. The shaft 42 has a rounded protruding knurled end 44 (FIG. 7) to provide a frictional compression engagement fit with a cross-bracket holding device 50. Referring to FIGS. 7-9 the cross-bracket holding device 50 comprises a disc-like outer portion 51 having a front lateral surface 52 and a rear lateral surface 53. A hole 54 passes through the center of the cross-bracket holding device 50 so as to receive and to frictionally engage the knurled end 44 of the shaft 42. The front lateral surface 52 of the cross-bracket holding device is recessed to form a channel 55 having a width equal to that of the cross-bracket 30 such that when the cross-bracket holding device 50 is mounted to the shaft 42, the end 44 of the shaft 42 will be aligned with and will matingly engage the hole 35 located in the middle portion 31 of the cross-bracket 30, enabling the central portion 31 of the cross-bracket to cooperatively engage the channel 55 of the cross-bracket holding device 50 and to be seated therein.
The cross-bracket holding device 50 is provided with two retaining clips 56 mounted adjacent to the channel 55 on diametrically opposed sides thereof. Each of the retaining clips 56 is operable between a first and a second position, and is normally biased toward operation in its first position to retainably engage the cross-bracket member 30 within the channel 55 and is movable to its second position for releasing and/or for accepting the cross-bracket member 30 respectively from and into retention within the channel 55.
The motor means 40 for each tray 3 are mounted to a support wall 60 disposed across and forming a rear portion 7 of each tray 3. The motor means 40 are mounted to the support walls 60 such that the shaft 42 projects therethrough at a position sufficient to support the rear portion of a vending coil 21 (which is properely mounted to the cross-bracket holding device 50 as above-described), above and spaced apart from the lower shelf surface 61 of the tray 3, (see FIGS. 4-6). The forwardly disposed portion of each coil 21 is also supported in a manner such that the lower portion of the coil 21 overlies and is spaced apart from the tray shelf surface 61. Support of the forwardly disposed portions of the dispensing coils 21 is accomplished by use of novel coil support apparatus of this invention, two preferred embodiments of which are described below.
Referring to FIGS. 4-6, a first preferred embodiment of a coil support apparatus for the forwardly disposed portion of a coil 21 is disclosed at 70. The coil support apparatus 70 is configured for mounting upon the shelf surface 61 and for engagement to and against the front edge 62 of the shelf 61. The coil support apparatus 70 includes a first elongate coil support member 71 having a base portion defining a first planar upper surface 72 disposed to lie above and generally parallel to the shelf surface 61. The first coil support member 71 is mounted in fixed engagement to the shelf surface 61 by means of a mounting stud 73 which projects through the shelf surface and into cooperatively mating engagement with the base portion of the first coil support member 71. The first coil support member 71 has a ramp surface 74 rearwardly extending from the planar upper surface 72 of the support member 71 to the shelf surface 61, forming a smooth continuous path between the shelf surface 61 and the planar upper surface 72 of the support member 71. The forward end of the support member 71 is terminated at an end portion 75 disposed forward of the front edge 62 of the shelf 61 at a distance approximately equal to the longitudinal distance between consecutive convolutions of the helical coil 21 to be supported by the support apparatus 70.
The coil support apparatus 70 further has a second coil support member 81 configured for mounting upon the shelf surface 61 and aligned parallel with and spaced apart from the first coil support member 71. The second coil support member 81 has a base portion defining a second planar upper surface 82 disposed to lie above and generally parallel to the shelf surface 61, and at a height such that the planar upper surfaces 72 and 82 of the first and second coil support member 71 and 81 respectively are generally co-planar. The second coil support member 81 is mounted in fixed engagement to the shelf surface 61 by means of a mounting stud 73 which projects through the shelf surface 61 and into cooperative mating engagement with the base portion of the second coil support member 81. The second coil support member 81 has a ramp surface 84 rearwardly extending from the planar upper surface 82 of the support member 81 and down to the shelf surface 61, forming a smooth continuous path between the shelf surface 61 and the planar upper surface 82 of the support member 81. The first and second support member 71 and 81 of the coil support apparatus 70 are disposed such that their respective ramp surfaces 74 and 84 are generally co-planar. The foward end of the support member 81 is terminated at a leading end portion 85 disposed to lie slightly forward of but adjacent the front edge 62 of the shelf 61, and longitudinally spaced back from the leading end portion 75 of the first support member 71 by approximately the longitudinal spacing between successive convolutions of the coil 21.
The first and second coil support members 71 and 81 respectively are fixedly connected in parallel spaced-apart alignment with one another by means of a beam member 87 laterally disposed between the first and second support members 71 and 81 respectively. The back surface of the beam member 87 is configured to matingly engage the front edge 62 of the shelf 61, and the top surface of the connecting beam member 87 is aligned co-planar with the shelf surface 61 to form a continuous sliding surface therewith. In the preferred embodiment, the forward edge of the connecting beam 87 is co-planar with the forward end surface 85 of the second coil support member 81. The back edge of the beam member 87 continuously laterally projects across and under the base portions of both the first and second coil support members 71 and 81 respectively, to provide continuous alignment engagement of the support beam 87 with the front edge 62 of the shelf 61 across the entire lateral dimension of the coil support apparatus 70. The first and second support members 71 and 81 respectively are laterally spaced apart from one another so as to cooperatively support by means of the inwardly disposed edges of their upper planar surfaces 72 and 82 respectively one of the helical coils 21 such that the lower surface of the supported coil is disposed to lie above and spaced apart from the shelf surface 61. In the preferred embodiment, the coil support apparatus 70 is constructed of durable plastic material, however, any other suitable material could be equally well employed within the spirit and intent of this invention.
The forward end portion 75 of the first coil support member 70 includes a display panel 76. In the preferred embodiment, the display panel 76 includes a first generally vertically oriented slot 77 and a second generally vertically oriented slot 78, suitable for accepting plastic or paper tab inserts (not illustrated) on which visual information such as product identification or price information can be visually displayed.
The above-described coil support apparatus 70 is particularly well suited for use in the dispensing of items having large, bulky packages such as potato chips and pastries. It should be noted that the coil support apparatus 70 need not extend over the entire length of the coil 21 which it supports, but is disposed to support the coil 21 only along a relatively short length thereof near its forwardly disposed end. Side panels 89 are placed between each of the dispensing coil units 20 and are mounted to the underlying shelf 61, and extend from the front portions 6 to the rear portions 7 of the respective trays 3. The side panels 89 function to provide laterial guide support for items to be dispensed in a forward direction upon the rotation of the vending coil 21 about its longitudinal axis, and maintain separation of dispensible items between adjacent ones of the dispensing coil units.
When the dispensing machine 1 is in operative use, the items to be dispensed, generally designated at 90 in FIG. 1, are loaded into the dispensing coil units for disposition between consecutive convolutions of the dispensing coils, as illustrated in FIG. 1. A purchaser selects that item he desires dispensed, by electrical control apparatus not disclosed herein, but of any type well known in the art of vending and dispensing machines, which control apparatus effects an energization of the motor means of the dispensing coil 21 which contains that selected dispensable item. The motor means 40 causes rotation of the selected coil 21 a predetermined number of rotational degrees (generally one full revolution) to effect a dispensing discharge or vend of the selected item to the purchaser. In operation of the preferred embodiment of the dispensing coil unit above described, as the dispensing coil 21 is rotated, the item to be dispensed travels in a forward direction along the winding 26 of the dispensing coil 21. Until reaching the coil support apparatus 70, the item to be dispensed is vertically supported by the underlying shelf surface 61. Upon reaching the coil support member 70 the item to be dispensed engages and is guided upwardly by the first and second ramp surfaces 74 and 84 respectively of the first and second coil support members 71 and 81, and is thereafter longitudinally guided along the upper planar surfaces 72 and 82 respectively thereof. When the item to be dispensed reaches the forward end portion 85 of the second coil support apparatus 81, the item package is caused to be tipped in the direction of the second coil support member 81, and falls by action of gravity from the retaining convolution of the support coil 21 and from the tray 3 into a discharge bin 91 of the machine 1, where it is retrieved by the purchaser.
Referring to FIGS. 14, 15 and 16, a second preferred embodiment of a coil support apparatus for supporting the forwardly disposed portion of the dispensing coil 21, is generally illustrated at 100. The coil support apparatus 100 includes a base member 101 having a top planar surface 102 and configured for mounting to the forward end of the tray 3 such that the base member 101 laterally extends across the front edge 62 of the tray shelf 61 with the top planar surface 102 of the base member 101 and the shelf surface 61 of the tray 3 forming a continuous sliding surface. The base member 101 further has a forward, generally vertically disposed end 103. The rearwardly disposed portion of the base member 101 has a mounting flange 104 rearwardly projecting for engagement with the lower side of the shelf 61, and is securely fastened to the forward end 6 of the tray 3 by means of mounting studs 105.
The coil support apparatus 100 further has an upright side panel 108 having a first generally planar side 109 and a second generally planar side 110. The upright side panel 108 is mounted to the shelf 61 and extends from th front portion 6 of the tray 3 to the rear portion 7 thereof. The coil support apparatus 100 further has a coil support member 112 mounted to and projecting generally vertically upward from the upper surface 102 of the base member 101 and extending from the forward end 103 of the base member 101 in a rearward direction generally parallel to the upright side panel 108. The coil support member 112 comprises a first generally vertically extending side portion 113 and a second generally vertically extending side portion 114, terminating at an elongate ramp surface 115 disposed above the shelf surface 61 and inclinded obliquely thereto. The rearwardly disposed trailing edge of the coil support member 112 is also inclined to form a ramp 116 extending at an angle from the first vertically disposed side 113 to the second vertically disposed side 114 of the coil support member 112 and forming a continuous sliding surface with the elongate ramp surface 115.
The upright side panel 108 and the elongate ramp surface 115 of the coil support member 112 are spaced apart a distance relative to one another which is less tha than the outer diameter of the helical coil 21 to be supported thereby, such that the vending coil 21 is cooperatively supported by the elongate ramp surface 115 and the first side 109 of the upright side panel 108 such that the lower surface of the coil 21 is disposed above and spaced apart from the underlying shelf surface 61. In the preferred embodiment, the first vertically disposed side 113 of the coil support member 112 of one dispensing coil unit 20 abuts in supportive manner the second planar surface 110 of the upright side panel 108 of the immediately adjacent dispensing coil unit 20.
The forward end 103 of the second coil support apparatus 100 includes a display panel 117. In the preferred embodiment, the display panel 117 includes a plurality of generally vertically oriented slots 118 suitable for accepting plastic or paper tab inserts (not illustrated) on which visual information such as product identification or price information can be visually displayed.
The coil support apparatus 100 above-described is particularly suitable for accommodating a helical coil 21 having a diameter less than that of the coils supported by the coil support apparatus 70, and is particularly well adapted for use in dispensing smaller items such as candy bars and the like which have packages less bulky than potato chips and pasteries. In operation, the items to be dispensed 120 by means of coils supported by the coil support apparatus 100 would generally be loaded into the dispensing coil 21, by placing the items between the convolutions thereof, in an upright position. To maintain the dispensable items 120 in their upright positions, a panel-like product quide member 130 is used to laterally support the dispensable items between the first side 109 of the upright side panel and the product guide member 130.
The product guide 130 is adjustably mounted to accommodate various widths of items to be carried by the coil 21. The product guide 130 comprises a channel shaped member having a side portion 131, a top portion 132 and a bottom portion 133, and extends in overlying manner along the entire length of the dispensing coil 21. The product guide member 130 is pivotally supported at two pivot points 134 and 135 at longitudinally spaced positions along the guide 130. Plastic sleeve members 136 and 137 are positioned between the top and bottom portions 132 and 133 respectively of the guide at the pivot points 134 and 135 respectively, and have vertically extending aperatures 138 and 139 respectively extending therethrough (see FIGS. 11-13).
Each of the product guide members 130 is supported by means of a plurality of pivot arms 140, having an upper vertical portion 141, a horizontally disposed middle portion 142 and a lower vertically disposed portion 143. The lower vertical portion 143 of the pivot arms 140 are mounted to pivotally ride in bracket members 145 mounted to extend from the second side wall surface 110 of that upright side panel 108 of the immediately adjacent coil support apparatus. The upper vertical portions 141 of the pivot arms 140 are inserted through the vertically aligned aperatures 138 and 139 of the plastic sleeve support members 136 and 137 respectively in the product guide 130 and frictionally engage the inner aperature surfaces of the plastic sleeve members 136 and 137, such that the product guide member 130 can be pivotally rotated to the desired lateral spacing from the first side 109 of the upright side panel 108 by rotating the product guide 130 about its pivot points 134 and 135 to the desired location, see FIGS. 10-13. Once the desired location has been attained, the frictional fit between the pivot arms 140 and the sleeve members 136 and 137 will maintain the lateral positioning of the product guide panel 130 until re-adjusted by an operator of the machine.
Each upright side panel 108 has mounted at its forward edge a tab member 150 projecting outwardly therefrom at an angle toward the coil support member 112. In the preferred embodiment, this angle is approximately 30° but may be any other suitable angle. The tab member 150 is preferably vertically positioned at that vertical height where the dispensing coil 21 contacts the side panel 108. The tab member 150 projects outwardly from the side panel 108 a distance sufficient to engage the forward edge of the front winding of the dispensing coil 21, at a position therealong spaced back from the first terminal 23 thereof. As the dispensing coil 21 is rotated during a dispensing operation, the tab member 150 will come into sliding engagement with the first winding of the vending coil 21. In normal operation, the dispensing coil is rotated about its longitudinal axis in a direction opposite to the direction of the coil windings. Therefore, once the coil has come into sliding engagement with the tab member 150, the tab member 150 will impart compressive forces to the dispensing coil 21 in the longitudinal direction of the coil such that further rotation of the coil causes a slight compression of the generally rigid coil 21. When the point of contact between the tab member 150 and the first winding of the coil 21 reaches and passes the first terminal 23 of the vending coil 21, the coil 21 disengages from the tab member 150, relieving the compression and the vending coil 21 rapidly expands to its normal length. The rapid expansion of the dispensing coil to its normal length provides a positive dispensing " push" to that article to be dispensed which is positioned within the first convolution of the dispensing coil, at the forward edge of the tray 3. Upon rapidly expanding, therefore, the dispensing coil 21 effects a vend of the item within its first convolution by positively ejecting that item over the edge of the top planar surface 102 of the base member 101, from whence it falls into the discharge bin 91 of the machine 1 by force of gravity.
While preferred configurations and embodiments of the invention have been disclosed herein, other modifications of the invention will be apparent to those skilled in the art in light of the foregoing description. This description is entended to provide concrete examples of specific embodiments which clearly disclose the present invention. Accordingly, the invention is not limited to any particular embodiment. All alternatives, modifications and variations of the present invention which fall within the spirit and broad scope of the appended claims are covered.
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